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The work is devoted to the study of some geometric invariants which can be associated to a partial differential operator. Recently L. Hörmander introduced the notion of a subprincipal symbol for a pseudodifferential operator. The subprincipal symbol is an invariant for every pse…
Pseudodifferential operators and applications: proceedings of the Symposium on Pseudodifferentia…
by Symposium on Pseudodifferential Operators & Fourier Integral Operators with Applications to Partial Differential Equations, Notre Dame), American Mathematical Society
fromProceedings of symposia in pure mathematics
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Type: Book